US PATENT SUBCLASS 252 / 301.25
.~.~ Azine containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

301.16  DF  ORGANIC LUMINESCENT MATERIAL CONTAINING COMPOSITIONS {6}
301.21  DF  .~ Optical brightening compositions {6}
301.25.~.~ Azine containing

DEFINITION

Classification: 252/301.25

(under subclass 301.21) Compositions which contain a heterocyclic compound having a six-membered ring with at least two hetero atoms, at least one of which is nitrogen.

SEE OR SEARCH CLASS

544, Organic Compounds, for compounds, per se, having a six-membered ring consisting of four ring carbons and two ring hetero atoms, at least one of which is nitrogen.